0 retained cycle captures. HRRR keeps three recent cycles plus an extended cycle. Times are reported model initializations; forecasts are frozen after each cycle update. Standard data may combine runs. History refreshes every minute. Extended: HRRR 48h; RRFS 84h. A previous complete extended run stays available while a newer one prepares.

Individual members provide stored temperature and precipitation only. Other fields remain blank. Select up to six forecasts; enable Blend to combine them.

HRRR, RRFS, REFS use prepared NOAA runs; the other models use Open-Meteo. REFS meteograms use published mean temperature, dewpoint, wind speed and clouds, with same-cycle arithmetic mean precipitation. REFS direction uses mean wind components; gusts and reflectivity remain unavailable. Extra fields prepare automatically at lower priority. RRFS coverage depends on background collection progress. Selecting an older run never triggers a download.

Verified Open-Meteo runs use the Single Runs API with an explicit UTC initialization. The server retains three recent runs plus an HRRR extended run and reuses each downloaded run. Standard mode saves one capture per reported initialization, checks metadata before and after downloading, and retains three recent cycles plus an HRRR extended cycle. These captures may contain data from multiple runs; they are not initialization-pinned forecasts. Valid times use America/New_York.

Blend mode weights each selected snapshot equally and aligns members by valid time. Spread is model disagreement, not a calibrated probability. Wind arrows point toward motion; directions indicate where wind comes from. Precipitation applies to the preceding hour and is liquid-water equivalent. Rain includes showers where supplied. Snowfall is new snow depth. Running totals cover displayed intervals; missing amounts leave totals unknown. Unsupported fields stay blank. Open-Meteo does not supply composite reflectivity. RRFS meteograms use NOAA reflectivity and leave values below 5 dBZ blank.

Weather data by Open-Meteo · charts, unit conversions and blends by Met Markets. NOAA observations use separate feeds. A forecast is not an airport observation.